Slag-casting apparatus



Feb. 8,1927, 1,616,855

w. T. HURST SLAG CASTING APPARATUS Filed Feb. 11, 1926 1 5-. aim-n.

Patented Feb. 8, .1927,

UNITED sTA'rs I I 1,616,855 "rear oFrIcE.

WILLIS r. nunsrfonrrrrsnunerr, PENNSYLVANIA.

SLAG -CASTING APPARATUS. I

' Application filed February 11, 1926. Serial No. 87,584'

by a rapid cooling in which receptacles or containers are suspended in quenching pits and which have associated therewith runners or troughs for conducting the slag from a furnace tothe receptacles.

I have found that in solidifying slag by the aforementioned process, the intensive heat of the molten slag has a tendency to form heat pockets underneath the receptacle which act as an insulation in preventing proper contact of the quenching fluid and frequently causes burning of the receptacle body. The heat pocketsare created by the accuniulation or trapping of steam caused by indentations in the surface of the receptacle and by the comparatiyely slow quenching action of the fluid relatlve to the intensity of heat dissipation through the walls of the receptacle.

It is among the objects of the present invention to overcome these difficulties by the provision of adequate quenching facilities which in addition to the quenching fluid in which the receptacle is suspended consists of means for agitating the quenching medium. I have also discovered that the shape of the receptacle influences the effectiveness of quenching and accordingly I have devised a form of receptacle which enhances the quenching effect.

In carrying out my invention I utilize the system for receiving the slag from the fur nace and conducting it to a receptacle similar to that disclosed in my patent.

The receptacle in accordance with the present invention is provided with inclined side walls converging at a slight inclination at the center line of the base, constituting the bottom of the receptacle, to permit the escape of steam bubbles. In the quenching pit I provide a system of pipe lines communicating with a source of fluid pressure which are adapted to emit jets of water or other suitable quenching fluid in the direction of the receptacle thus assuring adequate circulation of the quenching medium contained in the pit.

In the accompanying drawing constituting a part hereof, and in which like reference characters designate like parts, Fig. 1 is a slde elevational view of a receptacle 111 a quenching system for treating molten slag embodying the principles of my invention;

Fig. 2 is a cross sectional view thereof;

Fig. 3.15 a plan view;'Fig. 4 is a view partially in section and partially in elevation" of a pipe line for conducting the quenching fluid to the receptacle; and Fig. 5 is a diagrammatic view illustrating a portion of the receptacle and quenching means for acting upon it to pockets. 1

Referring to Figs. 1, 2 and .3 of the draw ing, the structure therein illustrated comprises a quenching pit 1 provided with tracks or rails 2 adapted to receive a plurality of flange wheels 3 supporting a receptacle 4. The pit 1 is adapted to hold the quenching liquid, preferably water, and is filled so that the quenchin liquid extends beyond the layer of slag deposited in the receptacle 4. Y

Underneath the receptacle I provide a plurahty of pipe lines 5 which are shown connected to a centrifu a1 pump 6 by a feed pipe 7, the pump icing actuated by a motor 8 or any other suitable prime mover. The pipes 5 are provided with nipples, Figs. 1, 2 and 4, or with orifices 10, Fig. 5, for the purpose of emitting a jet of quenching fluid in the direction of or against the surfaceof the receptacle 4.

In Fig. 2 I have illustrated the receptacle 4 as having inclined side walls 11 and a converging bottom 12 to permit the escape of steam bubbles that have a tendency to form around the portion of the receptacle surrounding the molten slag 18 thus further preventing the forming of heat pockets.

prevent the formation of heat As shown in Fig. 5 the walls or bottom of Y the receptacle may be of irregular shape havlng pockets or indentations 14 caused by warping or handling in use. By utilizing the orificed pipe lines in accordance with my invention the jets of quenching fluid are di- 1 rected to the entire surface of the receptacle and into the indentations 14 and in addition assures the circulation of the quenching fluid I contained in the quenching pit.

tom 12; By the utilization of thecirculating system herein shown and by virtue of the converging inclined shape of the base and Walls of the. receptacle steam bubbles are not permitted to accumulate, as is the case Where a straight bottom receptacle is employed Without a fluid pressure system.

It is evident frointhe toregoingmlescrip: tion of my invention that the method and apparatus for treating slag disclosedtherein providessimple and/efiicient means for rapidly quenching the molten slag'without producing detrimental eiiiects on the receptacle.

Although Ithave described aspecific embodiment of my invention, it will beobvious to those skilled in the art that: the receptacle may: take on Various forms and the fluid pressure system utilized for: producing a circulation of the quenching mediunr may be rearranged or adapted to cooperate With the receptacle in other Ways than that shown without departing from the principles herein set forth.

I claimz' v I 1. Apparatus for: treating molten: slag comprising a quenching pit adapted to contain Water, .a receptacle for receiving molten slag suspended in said pit, and a plurality of pipe lines disposedin said pit for emitting jets of quenching fluid under pressure against said receptacles.

2. Apparatus for treating molten slag comprising aquenching pit, a receptacle suspended in and partially submerged by quenching fluid in said pit and a plurality of jets for providing circulation oi the quenching fluid in said pit and particularly around the submerged portion of said receptacle.

3. Apparatus for treating molten slag comprising a pit containing a quenching fluid, a receptacle suspendedin and partially submerged in said pit, said receptacle being shaped to prevent accumulation of steam around its submergedportion and avplura'lity of jets for directing quenching fluid against the submerged portion of said receptacle to effect circulation of the quenching fluid.

In testimony whereof, I. sign my name.

WILLIS T. HURST. 

